/fast {on|off|status} goes through to chat rather than being handled by the internal command processor

What version of Codex CLI is running?

codex-cli 0.142.5

What subscription do you have?

nvidia?

Which model were you using?

gpt-5.5

What platform is your computer?

Linux 5b77c80-lcelt 6.17.0-35-generic #35~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue May 26 19:30:42 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

What terminal emulator and version are you using (if applicable)?

gnome-terminal

Codex doctor report

What issue are you seeing?

When running /fast off the message is going through to the chat like a normal message rather than being handled as a command. Same with /fast status. I can use /fast as a toggle but that doesn't match the documentation.

What steps can reproduce the bug?

Uploaded thread: 019f1b4c-5f68-71a2-83be-548fbcca0918

What is the expected behavior?

/fast off should disable Fast mode.
/fast status should report whether Fast mode is on or off.
Neither command should be sent to the assistant as chat text.

Additional information

Docs say /fast on, /fast off, and /fast status are valid

Repro steps

1. Start codex-cli 0.142.5.
2. Confirm banner shows gpt-5.5 xhigh fast.
3. Type /fast off at the start of the TUI composer.
4. Observe it is submitted as a normal chat message.
5. Repeat with /fast status.